fix for 0005655: Problems creating a new account (similar to 0005653)
fix for 0005949: signing up is a bit too restrictive

• don't increment last visit on account_update.php in case there is an error
  Now going "back" will work
  • move page name check to utility_api.php

git-svn-id: http://mantisbt.svn.sourceforge.net/svnroot/mantisbt/trunk@3699 <a class="text" href="/?p=mantisbt.git;a=object;h=f5dc347c">f5dc347c</a>-c33d-0410-90a0-b07cc1902cb9